module.exports = {
  presets: [
    [
      '@vue/cli-plugin-babel/preset',
      {
        useBuiltIns: "entry",
        corejs: 3,
      }
    ]
  ],
  plugins: [
    // 手动添加提案语法支持
    '@babel/plugin-proposal-optional-chaining', // 支持 ?.
    '@babel/plugin-proposal-nullish-coalescing-operator' // 支持 ??
  ],
  'env': {
    'development': {
      // babel-plugin-dynamic-import-node plugin only does one thing by converting all import() to require().
      // This plugin can significantly increase the speed of hot updates, when you have a large number of pages.
      'plugins': ['dynamic-import-node']
    }
  }
}
